Network Exposure Function (nef) Slice in a Wireless Communication Network

1. A method of operating a wireless communication network to serve a Network Exposure Function (NEF) slice to User Equipment (UE), the method comprising: an Access and Mobility Management Function (AMF) selecting an edge NEF slice for the UE; a Session Management Function (SMF) selecting a NEF address for an edge NEF element based on the edge NEF slice for the UE; a User Plane Function (UPF) exchanging Application Programming Interface (API) messages between the UE and the edge NEF element for the edge NEF slice based on the NEF address; and the edge NEF element exchanging the API messages with the UE over the UPF for the edge NEF slice.

2. The method of claim 1 wherein the edge NEF element exchanging the API messages with the UE over the UPF comprises the edge NEF element exchanging the API messages with the UE over the UPF and the edge NEF element exchanging at least a subset of the API messages with a core NEF element.

3. The method of claim 1 wherein the edge NEF element exchanging the API messages with the UE over the UPF comprises the edge NEF element exchanging the API messages with the UE over the UPF and the edge NEF element exchanging the API messages with an anchor NEF element.

4. The method of claim 1 wherein: in response to UE mobility, the SMF selecting a new NEF address for a new edge NEF element for the edge NEF slice for the UE; another UPF exchanging new API messages between the UE and the new edge NEF element based on the new NEF address for the edge NEF slice; and the new edge NEF element exchanging the new API messages with the UE over the other UPF for the edge NEF slice.

5. The method of claim 4 further comprising the edge NEF element transferring context for the UE to the new edge NEF element.

6. The method of claim 1 further comprising: the AMF selecting a local NEF slice for another UE based on a geographic location of the other UE; and the SMF selecting another NEF address for a local NEF element; the UPF exchanging the API messages between the other UE and the local NEF element for the local NEF slice; and the local NEF element exchanging the API messages with the other UE over the UPF for the local NEF slice.

7. The method of claim 1 wherein the edge NEF exchanging the API messages with the UE comprises the edge NEF receiving UE status data from a user application in the UE.

8. The method of claim 1 wherein the edge NEF exchanging the API messages with the UE comprises the edge NEF receiving a network request from an Application Server (AS) for the UE.

9. The method of claim 1 wherein the UPF exchanging the API messages between the UE and the edge NEF comprises exchanging the API messages between a non-Third Generation Partnership Project (non-3GPP) UE and the edge NEF over a non-3GPP Interworking Function (IWF) and the UPF.

10. A wireless communication network to serve a Network Exposure Function (NEF) slice to User Equipment (UE), the wireless communication network comprising: an Access and Mobility Management Function (AMF) configured to select an edge NEF slice for the UE; a Session Management Function (SMF) configured to select a NEF address for an edge NEF element based on the edge NEF slice for the UE; a User Plane Function (UPF) configured to exchange Application Programming Interface (API) messages between the UE and the edge NEF element for the edge NEF slice based on the NEF address; and the edge NEF element configured to exchange the API messages with the UE over the UPF for the edge NEF slice.

11. The wireless communication network of claim 10 further comprising: a core NEF element; and wherein: the edge NEF element is configured to exchange the API messages with the UE over the UPF and exchange at least a subset of the API messages with the core NEF element to exchange the API messages with the UE over the UPF.

12. The wireless communication network of claim 10 further comprising: an anchor NEF element; and wherein: the edge NEF element is configured to exchange the API messages with the UE over the UPF and exchange the API messages with the anchor NEF to exchange the API messages with the UE over the UPF.

13. The wireless communication network of claim 10 wherein: in response to UE mobility, the SMF is further configured to select a new NEF address for a new edge NEF element for the edge NEF slice for the UE; and further comprising: another UPF configured to exchange new API messages between the UE and the new edge NEF element based on the new NEF address for the edge NEF slice; the new edge NEF element configured to exchange the new API messages with the UE over the other UPF for the edge NEF slice; and wherein: the edge NEF element is further configured to transfer context for the UE to the new edge NEF element.

14. The wireless communication network of claim 10 further comprising: a local NEF element; and wherein: the AMF is further configured to select a local NEF slice for another UE based on a geographic location of the other UE; the SMF is further configured to select another NEF address for a local NEF element; the UPF is further configured to exchange the API messages between the other UE and the local NEF element for the local NEF slice; and the local NEF element is configured to exchange the API messages with the other UE over the UPF for the local NEF slice.

15. The wireless communication network of claim 10 wherein the edge NEF is further configured to receive UE status data from a user application in the UE to exchange the API messages with the UE.

16. The wireless communication network of claim 10 wherein the edge NEF is further configured to receive a network request from an Application Server (AS) for the UE to exchange the API messages with the UE.

17. The wireless communication network of claim 10 wherein the UPF is further configured to exchange the API messages between a non-Third Generation Partnership Project (non-3GPP) UE and the NEF over a non-3GPP Interworking Function (IWF) and the UPF to exchange the API messages between the UE and the NEF.

18. A wireless communication network comprising: a core data center configured to execute an Access and Mobility Management Function (AMF), Session Management Function (SMF), and core Network Exposure Function (NEF); an edge data center configured to execute a User Plane Function (UPF) and an edge NEF; the AMF configured to authorize a User Equipment (UE) for an edge NEF slice that comprises the edge NEF and select the edge NEF slice based on the authorization; the SMF configured to select a NEF address for the edge NEF based on the edge NEF slice for the UE to determine context for the UE and the edge NEF slice; the UPF configured to exchange Application Programming Interface (API) messages between the UE and the edge NEF for the edge NEF slice based on the NEF address; the edge NEF configured to exchange the API messages with the UPF and the core NEF; and the core NEF configured to exchange the API messages with the edge NEF.

19. The communication network of claim 18 wherein the edge NEF is further configured to receive UE status data from a user application in the UE.

20. The communication network of claim 18 wherein the edge NEF is further configured to receive a network request from an Application Server (AS) for the UE.